| Portage to Mangualde | 3,885.64 mi (6,253.34 km) |
| Portage to Marco de Canavezes | 3,848.41 mi (6,193.41 km) |
| Portage to Marinha Grande | 3,860.76 mi (6,213.29 km) |
| Portage to Massama | 3,878.87 mi (6,242.44 km) |
| Portage to Matosinhos | 3,823.35 mi (6,153.08 km) |
| Portage to Mealhada | 3,861.57 mi (6,214.60 km) |
| Portage to Melgaco | 3,812.23 mi (6,135.20 km) |
| Portage to Melres | 3,840.91 mi (6,181.35 km) |
| Portage to Mira | 3,846.88 mi (6,190.95 km) |
| Portage to Miranda do Corvo | 3,876.54 mi (6,238.68 km) |
| Portage to Mirandela | 3,882.21 mi (6,247.81 km) |
| Portage to Mogadouro | 3,908.36 mi (6,289.90 km) |
| Portage to Moimenta da Beira | 3,879.66 mi (6,243.71 km) |
| Portage to Moita | 3,896.17 mi (6,270.28 km) |
| Portage to Moncao | 3,804.02 mi (6,121.98 km) |
